Double coil



FIG. 1 is an isometric view of the front of a double coil, which embodies my design;

FIG. 2 is an isometric view of the back of the double coil;

FIG. 3 is a top plan view of the double coil;

FIG. 4 is a bottom plan view of the double coil.

FIG. 5 is a side view of the double coil;

FIG. 6 is a side view of the double coil;

FIG. 7 is a side view of the double coil; and,

FIG. 8 is a side view of the double coil.

The broken lines depict portions of the double coil that form no part of the claimed design.

The dot dash dot broken lines depict the boundaries of the claim and form no part thereof. 

CLAIM The ornamental design for a double coil, as shown and described. 